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If you were looking for the items in Pokémon Mystery Dungeon, see trade items.

Gems (Japanese: ジュエルJewel) are one-use type-enhancing items introduced in Generation V. There are 17 types of Gems, one corresponding to each of the 17 types. A Gem is consumed when the Pokémon holding it uses a damaging attack that matches the Gem's type; the attack's power is boosted by 50%. The Gem will not be consumed if the attack misses. Gems are usually found in dust clouds.